At least you're honest.
Lesson learned like you said.
The gypsy scum bag was testing you and played you like a harp.
First broke the ice and asked you for a beer, you said yes, and he went into full gypsy mode, scoped out your joint and even felt comfortable enough to mark your territory like a dog which in his mind told him you were a pushover and he was the dominant male in this situation.
By you not doing anything he will probably be back, when you're not.
Yep, i'd tell all your closest neighbors to BOLO for this dirtbag.